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All Physics Chemistry Botany Zoology

Language English हिंदी

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Which of the following is symbiotic nitrogen fixer?

A. Rhodospirillum B. Azotobacter C. Beijernickia D. Rhizobium

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Explanation

Page number-202

12.6 Metabolism of Nitrogen

12.6.2 Biological Nitrogen Fixation

Mineral Nutrition

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Which of the following is free living nitrogen fixing cyanobacteria?

A. Anabaena B. Azotobacter C. Beijernickia D. Rhodospirillum

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Explanation

Page number-202

12.6 Metabolism of Nitrogen

12.6.2 Biological Nitrogen Fixation

Mineral Nutrition

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Rhizobium

A. Rod shaped B. Legume-bacteria relationship C. Has relationship with roots of several legumes such as alfalfa, sweet clover sweet pea, Lentils, garden Pea, broad bean and clover beans D. All of these

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Explanation

Page number-202

12.6 Metabolism of Nitrogen

12.6.2 Biological Nitrogen Fixation

Mineral Nutrition

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The most common association on roots is as

A. Lichene B. Nodules C. Beads D. Pneumathodes

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Explanation

Page number-202

12.6 Metabolism of Nitrogen

12.6.2 Biological Nitrogen Fixation

Mineral Nutrition

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The central portion of nodule is pink in color due to

A. Leg- haemoglobin B. Haemoglobin C. RBC D. Myoglobin

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Explanation

Page number-202

12.6 Metabolism of Nitrogen

12.6.2 Biological Nitrogen Fixation

Mineral Nutrition

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Which of the following does not happen during nodule formation?

A. Rhizobium bacteria contact a susceptible root hair, divide near it B. Successful infection of root hair causes it to curl C. Infected thread carries the bacteria to the inner cortex D. The bacteria get modified into rod shaped bacteroides and cause inner cortical and endodermal cells to divide

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Explanation

Page number-203

12.6 Metabolism of Nitrogen

12.6.2 Biological Nitrogen Fixation

Mineral Nutrition

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Nodule formation is a result of

A. Division and growth of cortical cells B. Division and growth of pericycle cells C. Division and growth of endodermal cells D. Both A and B

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Explanation

Page number-203

12.6 Metabolism of Nitrogen

12.6.2 Biological Nitrogen Fixation

Mineral Nutrition

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To produce two molecules of ammonia, how many ATP are hydrolysed?

A. 16 B. 8 C. 4 D. 32

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Explanation

Page number-203

12.6 Metabolism of Nitrogen

12.6.2 Biological Nitrogen Fixation

Mineral Nutrition

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Enzyme Nitrogenase is

A. Highly sensitive to the molecular oxygen B. Least sensitive to the molecular oxygen C. Highly sensitive to carbon dioxide D. Least active enzyme

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Explanation

Page number-203

12.6 Metabolism of Nitrogen

12.6.2 Biological Nitrogen Fixation

Mineral Nutrition

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To protect nitrogenase from oxygen, which of the following in nodule will act as scavenger

A. Leg-haemoglobin B. Anaerobic mode of life C. Both A and B D. Myoglobin

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Explanation

Page number-203

12.6 Metabolism of Nitrogen

12.6.2 Biological Nitrogen Fixation

Mineral Nutrition

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